After finally researching construction in 75 BC, my catapults allowed my war against Suleiman to progress, and I conquered all of the Ottoman cities by 600 AD.
I captured some barb cities in the south, then expanded onto the island, so I had more land and pop than the AIs, but my neighbors were doing better techwise. Cyrus signed a defense pact with me in 1340. I was preparing for a war against HC, when he peace-vassaled to Cyrus in 1450.

I didn't want to fight both my neighbors at once, but the other AI were a long way away. As I researched towards steel to build cannon, I converted to Buddhism (HC had built the AP) and spread that religion enough to take over the AP Resident's seat. Now I wouldn't have to worry about pesky votes.
HC relieved my worries by renouncing his peace-vassalage in 1600!

Immediately I begged a peace treaty with Cyrus (he had no gold, so I asked for and received a map) and declared against HC. He already had rifles and cavalry against my cataphracts and cannon, but he didn't have enough of them. I captured three cities, including his capital which had a bunch of wonders, and accepted his capitulation in 1645.
In a short while, I also had rifles, and I attached Cyrus in 1705. I had to take six of his cities, with another bunch of wonders, before he bent the knee in 1770. Meanwhile, Charlemagne and Monty had been fighting a war. Monty capitulated to Charley in 1775, even though no cities had changed hands!
I had been late to astronomy (even though I got the circumnavigation bonus). Now I built an invasion fleet and sent my army across the seas. After demanding 1 gold from Charlemagne, I attacked Frederick in 1806. He capitulated in 1820, after losing three cities, including Berlin.
War with Charlemagne and Monty followed in 1826, as soon as our peace treaty expired. I captured two HRE cities, Monty broke free from Charlemagne, and then Charlemagne capitulated to me, giving me a domination victory in 1834.